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electrones= 4k
neutrones= 8k
formula
A=Z+N
132= 4K + 8K
132= 12K
132/12=K
11=K
remplazando
electrones = 4 (11)=44
neutrones = 8 (11)=88
se cumple que el numero de electrones es igual a protones y igual a numero atómico
e-=p+=z
entonces Z= 44